package cn.wolfcode.luowowo.search.service.impl;

import cn.wolfcode.luowowo.search.domain.StrategyTemplate;
import cn.wolfcode.luowowo.search.query.StrategySearchQuery;
import cn.wolfcode.luowowo.search.repository.StrategyTemplateRepository;
import cn.wolfcode.luowowo.search.service.IStrategyEsService;
import cn.wolfcode.luowowo.search.vo.StatisVO;
import com.alibaba.dubbo.config.annotation.Service;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.aggregations.bucket.composite.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;

import java.util.*;

@Service
public class StrategyEsServiceImpl implements IStrategyEsService {

    @Autowired
    private StrategyTemplateRepository repository;

    @Override
    public void save(StrategyTemplate template) {
        repository.save(template);
    }

    @Override
    public List<Map<String, Object>> queryThemeCommend() {
        List<Map<String, Object>> data = new ArrayList<>();
        List<StatisVO> list = this.getStatisVOList("themeId", "themeName", "themeGroup");
        //优化2: 取前面10
        if (list.size() > 10) {
            list = list.subList(0, 10);
        }

        //步骤2:通过主题id: themeid查询目的地集合///////////////////////////
        Map<String, Object> map = null;
        for (StatisVO vo : list) {
            map = new HashMap<>();
            //vo主题
            map.put("theme", vo);
            //某一个主题下面, 关联的目的地集合
            List<StatisVO> dests = this.getDestByThemeId(vo.getId());
            map.put("dests", dests);
            data.add(map);
        }
        //步骤3:通过步骤1,步骤2数据,组装成最终的data数据,并返回////////////////
        return data;
    }

    private List<StatisVO> getStatisVOList(String idField, String idName, String groupName) {
        List<CompositeValuesSourceBuilder<?>> sources = new ArrayList<>();
        TermsValuesSourceBuilder idSource = new TermsValuesSourceBuilder("id");
        idSource.field(idField);
        TermsValuesSourceBuilder nameSource = new TermsValuesSourceBuilder("name");
        nameSource.field(idName);
        sources.add(idSource);
        sources.add(nameSource);

        //构造分组语法
        CompositeAggregationBuilder aggregationBuilder
                = new CompositeAggregationBuilder(groupName, sources);

        //es查询语句构建类
        NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder();
        builder.addAggregation(aggregationBuilder);
        //分页
        builder.withPageable(PageRequest.of(0, 1));
        //明确指定查那个索引, 哪个类型
        builder.withIndices(StrategyTemplate.INDEX_NAME);
        builder.withTypes(StrategyTemplate.TYPE_NAME);
        //执行查询语句, 返回结果
        AggregatedPage<StrategyTemplate> search = (AggregatedPage<StrategyTemplate>) repository.search(builder.build());
        InternalComposite themeGroup = search.getAggregations().get(groupName);
        List<StatisVO> list = new ArrayList<>();
        for (CompositeAggregation.Bucket bucket : themeGroup.getBuckets()) {
            Long id = Long.parseLong(bucket.getKey().get("id").toString());
            String name = bucket.getKey().get("name").toString();
            Long count = bucket.getDocCount();

            StatisVO vo = new StatisVO();
            vo.setCount(count);
            vo.setId(id);
            vo.setName(name);
            list.add(vo);
        }

        //优化1: 排序 -- list集合排序
        Collections.sort(list, new Comparator<StatisVO>() {
            //比较器, 比较元素在集合中位置
            //compare 比较方法, 返回
            // < 0 : 表示小于
            // = 0 : 表示等于
            // > 0 : 表示大于
            @Override
            public int compare(StatisVO o1, StatisVO o2) {
                //倒排序
                Long ret = o2.getCount() - o1.getCount();
                return ret.intValue();
            }
        });
        return list;
    }

    @Override
    public List<StatisVO> queryConditionChina() {
        return this.getStatisVOList
                ("provinceId", "provinceName", "provinceGroup");

    }

    @Override
    public List<StatisVO> queryConditionAboard() {
        return this.getStatisVOList
                ("countryId", "countryName", "countryGroup");

    }

    @Override
    public List<StatisVO> queryConditionThemes() {
        return this.getStatisVOList
                ("themeId", "themeName", "themeGroup");
    }

    @Override
    public Page query(StrategySearchQuery qo) {
        TermQueryBuilder query = null;

        PageRequest of = PageRequest.of(qo.getCurrentPage() - 1, qo.getPageSize(),
                Sort.Direction.DESC, qo.getOrderBy());

        if (qo.getType() == StrategySearchQuery.CONDITION_TYPE_COUNTRY) {
            query = QueryBuilders.termQuery("countryId", qo.getTypeValue());
        }else if (qo.getType() == StrategySearchQuery.CONDITION_TYPE_PROVINCE){
            query = QueryBuilders.termQuery("provinceId", qo.getTypeValue());
        }else if (qo.getType() == StrategySearchQuery.CONDITION_TYPE_THEME){
            query = QueryBuilders.termQuery("themeId", qo.getTypeValue());
        }

        if (query == null) {
            return repository.findAll(of);
        }else {
            return repository.search(query, of);
        }
    }

    @Override
    public List<StrategyTemplate> findByDestName(String destName) {
        return repository.findByDestName(destName);
    }

    private List<StatisVO> getDestByThemeId(Long themeId) {
        List<StatisVO> vos = new ArrayList<>();
        List<StrategyTemplate> templates = repository.findByThemeId(themeId);
        //上面查询查到时 es攻略list集合, 前面需要知识目的id 目的地name
        //优化3: 目的地去除重复
        List<String> list = new ArrayList<>();

        for (StrategyTemplate template : templates) {
            if (!list.contains(template.getDestName())) {
                StatisVO vo = new StatisVO();
                vo.setId(template.getId());
                vo.setName(template.getDestName());
                vos.add(vo);
                list.add(template.getDestName());
            }
        }
        return vos;
    }
}
